CN108695543A - Secondary cell and its manufacturing method - Google Patents
Secondary cell and its manufacturing method Download PDFInfo
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- CN108695543A CN108695543A CN201810275181.7A CN201810275181A CN108695543A CN 108695543 A CN108695543 A CN 108695543A CN 201810275181 A CN201810275181 A CN 201810275181A CN 108695543 A CN108695543 A CN 108695543A
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- Prior art keywords
- counter
- rotary
- ing plate
- rivet
- outer edge
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
The secondary cell for having pressure-type failure of current mechanism to be manufactured with high production rate by inhibiting failure welding is provided.Secondary cell disclosed herein, has:Electrode body;Battery case stores the electrode body;Electrode terminal is electrically connected with the electrode body;With failure of current mechanism, conductive path between the electrode body and the electrode terminal is configured, and when pressure in the battery case rises cuts off the conductive path.The failure of current mechanism has rivet and is welded in the counter-rotary-ing plate of the rivet.Continuous weld mark there are one being formed in the failure of current mechanism.One continuous weld mark has in week shape the continuous all shape portions in outer edge along the counter-rotary-ing plate.The beginning and end of one continuous weld mark has been located off the position in all shapes portion.
Description
Technical field
The present invention relates to secondary cell and its manufacturing methods.
Background technology
The secondary cells such as lithium rechargeable battery (lithium secondary battery), compared with existing battery, light-weight and energy is close
Degree is high, thus be used as PC, portable terminal in recent years etc. the so-called portable power supply, vehicle traction electricity consumption
Source.Lithium rechargeable battery especially light-weight and that high-energy density can be obtained, it can be expected that as electric vehicle (EV), mixing
The driving for closing the vehicles such as power vehicle (HV), plug-in hybrid-power automobile (PHV) is more next from now on high-output power power supply
It is more universal.
Secondary cell, particularly lithium rechargeable battery, it is desirable that safe when its safety, particularly overcharge.
Lithium rechargeable battery is usually enclosed-type battery, when due to some charging when provide more than electric current flowing to become
For overcharge condition when, cell voltage is got higher, and causes the rising of inner pressure of battery, the rising of battery temperature.Therefore, in lithium ion two
In primary cell, various Security Countermeasures are sought for overcharge, an example of Security Countermeasures is pressure sensitive failure of current mechanism
(CID)。
About pressure sensitive failure of current mechanism, Patent Document 1 discloses following technologies:By the way that counter-rotary-ing plate is fixed on
After rivet, the week in the outer edge of counter-rotary-ing plate carries out laser welding, to which counter-rotary-ing plate and riveted joint are manufactured pressure sensitive
Failure of current mechanism.
Citation
Patent document
Patent document 1:Japanese Patent Application Publication 2016-110701 bulletins
Invention content
In the technology described in patent document 1, laser welding is carried out only along the outer edge of counter-rotary-ing plate.Therefore, it is in week
Laser welding is carried out to shape, but the beginning and end of laser welding is located in all shapes portion.In this way, the starting point in laser welding and end
In the case that point is located at week above, it is easy to become unstable in starting point fusion penetration, solidification cracking is easy to happen in terminal point, therefore can
Failure welding can occur.Therefore, the technology recorded in patent document 1, existing in terms of the productivity of failure of current mechanism improves
Leeway.
Therefore, the purpose of the present invention is to provide by inhibiting failure welding to which what is manufactured with high production rate has pressure-type
The secondary cell of failure of current mechanism.
Secondary cell disclosed herein, has:Electrode body;Battery case stores the electrode body;Electrode terminal,
It is electrically connected with the electrode body;And failure of current mechanism, it configures between the electrode body and the electrode terminal
Conductive path, and when pressure in the battery case rises cut off the conductive path.The failure of current mechanism, tool
Standby rivet and the counter-rotary-ing plate for being welded in the rivet.In the failure of current mechanism, there are one continuous weld marks for formation.Institute
A continuous weld mark is stated, there is in week shape the continuous all shape portions in outer edge along the counter-rotary-ing plate.One company
The beginning and end of continuous weld mark has been located off the position in all shapes portion.
According to such composition, due to the starting point of weld mark when laser welding (i.e. starting point) and weld mark terminal (
Terminal when laser welding) all shape portions at joint portion as counter-rotary-ing plate and rivet are had left, therefore can eliminate by starting point
The failure welding caused by fusion penetration is unstable and the generation of the solidification cracking of terminal point.That is, according to such composition, being capable of providing
The secondary cell for having pressure-type failure of current mechanism by inhibiting failure welding to be manufactured with high production rate.
Herein in a preferred scheme for disclosed secondary cell, the beginning and end of the weld mark is located at institute
It states on rivet.
According to such composition, weld mark will not cause harmful effect to the performance of counter-rotary-ing plate.
Herein in a preferred scheme for disclosed secondary cell, the rivet is in towards battery case
The formation in portion has the outside region outstanding having on the face of weld mark towards all shape portions of the weld mark, the weld mark
Beginning and end is located at the region.
According to such composition, the beginning and end of weld mark is arranged on rivet and becomes easy.
The manufacturing method of secondary cell disclosed herein, including make described in process and the use of failure of current mechanism
The failure of current mechanism of making carrys out the process of secondary cell for assembling,
The process for making failure of current mechanism includes the following steps:
The counter-rotary-ing plate is fixed on the rivet in a manner of the outer edge of counter-rotary-ing plate contact rivet;
Welding laser is scanned since the 1st position of the outer edge for leaving the counter-rotary-ing plate, until the counter-rotary-ing plate
Outer edge;
Along the outer edge of the counter-rotary-ing plate welding laser is scanned in all shapes;With
Welding laser is scanned away from the 2nd position of the outer edge of the counter-rotary-ing plate.
According to such composition, even if the starting point fusion penetration in laser welding is unstable, in addition, even if in laser welding
There are solidification crackings for terminal point, since beginning and end all has left the outer of the counter-rotary-ing plate at the joint portion as counter-rotary-ing plate and rivet
Edge, therefore can steadily weld counter-rotary-ing plate and rivet in the outer edge of counter-rotary-ing plate.That is, according to such composition, Neng Gouti
The secondary cell for having pressure-type failure of current mechanism for use by failure welding is inhibited to be manufactured with high production rate.
Herein in a preferred scheme for the manufacturing method of disclosed secondary cell, the counter-rotary-ing plate is had left
1st position of outer edge and the 2nd position of outer edge for having left the counter-rotary-ing plate are located on rivet.
According to such composition, laser welding will not cause harmful effect to the performance of counter-rotary-ing plate.
Herein in a preferred scheme for the manufacturing method of disclosed secondary cell, the rivet is being swashed
There is the outside region outstanding towards the outer edge of the counter-rotary-ing plate on the face of photocoagulation, leave the outer edge of the counter-rotary-ing plate
The 1st position and the 2nd position of the outer edge of leaving the counter-rotary-ing plate be located at the region.
According to such composition, by the 1st position of the outer edge for having left the counter-rotary-ing plate and the counter-rotary-ing plate is had left
The 2nd position of outer edge be set on rivet and become easy.
Description of the drawings
Fig. 1 is the stereogram of the shape for the lithium rechargeable battery for showing schematically that one embodiment of the present invention is related to.
Fig. 2 is the schematic section for enlargedly indicating failure of current mechanism at the II-II lines of Fig. 1.
Fig. 3 is the sectional view of the failure of current mechanism at the III-III lines of Fig. 2.
Fig. 4 is that the laser welding in the manufacturing method of the secondary cell for being related to one embodiment of the present invention carries out
Figure illustrating, showing schematically the rivet and counter-rotary-ing plate observed from the direction being equivalent to inside battery case.
Reference sign
10:Lithium rechargeable battery
15:Positive external terminal
16:Negative outer terminal
20:Battery case
30:Failure of current mechanism
32:Connecting elements
34:Counter-rotary-ing plate
35:Rivet
60:Weld mark
61:All shape portions
62:Starting point
63:Terminal
Specific implementation mode
Hereinafter, illustrating embodiments of the present invention on one side with reference to attached drawing on one side.Furthermore it is especially mentioned in this specification
Other than item, the required content of the implementation present invention is not (for example, characterize the general composition and system of the secondary cell of the present invention
Make technique), it can be grasped as the design item of the technical staff based on the state of the art.The present invention can be based on
Content and technical common sense in this field disclosed in this specification are implemented.In addition, in the following figures, for obtaining phase
The component of same-action and position are attached to identical label to illustrate.In addition, in each figure size relationship (for example, length,
Width, thickness etc.) do not reflect actual size relationship.
Hereinafter, by taking lithium rechargeable battery as an example, detailed description of embodiments of the present invention, but present embodiment
The secondary cell being related to is not limited to lithium rechargeable battery.
Furthermore in the present specification, " secondary cell " refers to the general electrical storage device that can be repeatedly charged and discharged, and is to include
Term including the charge storage elements such as so-called accumulator and double layer capacitor.In the present specification, " lithium rechargeable battery "
Refer to that charge and discharge are realized by the movement of the charge of the adjoint lithium ion of positive and negative interpolar using lithium ion as charge carrier
Secondary cell.
Fig. 1 is the stereogram for the shape for showing schematically lithium rechargeable battery of the present embodiment.Fig. 2 is Fig. 1
The sections II-II at the schematic section for enlargedly indicating failure of current mechanism.
Lithium rechargeable battery 10 of the present embodiment, as shown in Figure 1, by by the electrode body of flat pattern (not
Diagram) it is accommodated in the inside of flat rectangular battery case 20 together with electrolyte (not shown) and constitutes.Present embodiment
The lithium rechargeable battery 10 being related to is enclosed-type battery.
Shell 20 has:Housing main body 21 with opening portion;With the lid 22 for blocking the opening portion.21 quilt of housing main body
Be formed as upper opening of cuboid box-formed shape.Lid 22 is rectangle tabular body, and (is not schemed with the anode with electrode body
Showing) the positive external terminal 15 of electrical connection and the negative outer terminal 16 that is electrically connected with cathode (not shown) be exposed to its upper table
The mode in face (outside of shell 20) is arranged.The liquid injection port 17 and safety valve 18 of injection electrolyte are additionally provided on lid 22.
The material for constituting shell 20 is not particularly limited, it is preferable to use aluminium, aluminium alloy.
For constituting the material and component of electrode body, it is not particularly limited, can uses and previous lithium ion two
The same material of electrode body and component having in primary cell.It is, for example, possible to use by positive, the long sheet of long sheet every
Plate, long sheet cathode laminated body winding made of rolled electrode bodies, by the anode of sheet, the partition board of sheet, sheet it is negative
The multilayer electrode body etc. that pole is laminated.
Anode used in electrode body can be formed with anode on the positive electrode collector (such as aluminium foil) of sheet
The structure of active material layer.As positive active material contained in the positive electrode active material layer, can be not particularly limited
Use the one or more of the substance used in lithium rechargeable battery all the time.Conjunction as a positive electrode active material
Suitable example, can enumerate the lithium complex metal oxide of layer structure, spinel structure etc. (for example, LiNi1/3Co1/3Mn1/3O2,
LiNiO2,LiCoO2,LiFeO2,LiMn2O4,LiNi0.5Mn1.5O4,LiFePO4Deng) etc..
Cathode used in electrode body can be formed with cathode on the negative electrode collector (such as copper foil) of sheet
The structure of active material layer.For negative electrode active material contained in the negative electrode active material layer, can also be not particularly limited
Ground uses the one or more of the substance used in lithium rechargeable battery all the time.As negative electrode active material
Suitable example can enumerate carbon materials such as graphite (natural graphite, artificial graphite), low-crystalline carbon (hard carbon, soft carbon) etc..
For partition board, can be not particularly limited to use and the partition board used in lithium rechargeable battery all the time
Same partition board.As the suitable example of partition board, the Porous piece being made of polyolefin-based resins can be enumerated.
Electrolyte can be not particularly limited to use and the non-water power used in lithium rechargeable battery all the time
Solve the same electrolyte of liquid.As the suitable example of electrolyte, it can enumerate and contain lithium salts in the nonaqueous solvents of carbonates etc.
(preferably LiPF6) etc. supporting electrolytes nonaqueous electrolytic solution etc..Furthermore can also using solid-like or gelatinous electrolyte come
Instead of electrolyte.
In the inside of shell 20, it is provided with the rising of shell internal pressure and the failure of current mechanism 30 that is acted.Electricity
Flow conductive path of the configuration of cutting mechanism 30 between the anode (not shown) and positive external terminal 15 of electrode body.Failure of current
Mechanism 30 is configured to:Gas is generated in the inside of shell 20 in overcharge due to lithium rechargeable battery 10 etc., to
In the case that shell internal pressure rises, charging can be cut off by cutting off from positive external terminal 15 to the conductive path of anode
Electric current.
Failure of current mechanism 30, specifically, as shown in Fig. 2, be made of connecting elements 32, counter-rotary-ing plate 34 and rivet 35,
The connecting elements 32 is electrically connected with anode, and is played a role as positive pole current collections terminal, the counter-rotary-ing plate 34 and connecting elements
32 electrical connections, the rivet 35 is electrically connected with counter-rotary-ing plate 34, and will be connected to inside and outside shell.Connecting elements 32, counter-rotary-ing plate 34 and
Rivet 35, configures in order from enclosure towards outside, and is metal conductive member.These components play by anode and
It is exposed to the effect of the conductive path of the conducting of positive external terminal 15 of shell exterior, and has respectively constituted one of conductive path
Point.The charge and discharge of lithium rechargeable battery 10 are carried out by above-mentioned conductive path.As above-mentioned conductive member, it is preferable to make
With aluminium, aluminium alloy.
Connecting elements 32 has the part (plate-like portion) with plate, is formed in the plate-like portion and is connect with counter-rotary-ing plate 34
Interconnecting piece 33.
Counter-rotary-ing plate 34 is electrically connected by being contacted with interconnecting piece 33.In the present embodiment, counter-rotary-ing plate 34 is circular plate
Body.In addition, counter-rotary-ing plate 34, the central portion 40 for being located therein centre is relatively prominent to enclosure (lower section of Fig. 2).It is centrally located
The peripheral portion 41 on the periphery in portion 40, it is upward to shell outer inclination with the outside of trend reverses plate 34.Moreover, counter-rotary-ing plate
34, it is welded in its outer edge 42 and rivet 35.Can also be rectangle etc. furthermore the shape of counter-rotary-ing plate 34 is not limited to circle.
Rivet 35 is fitted to the through hole for being formed in lid 22.It is formed with recess portion sky in the enclosure side of rivet 35
Between.It is formed with stage portion 50 in the top end part of the periphery wall surface in the recess portion space.It is configured with counter-rotary-ing plate 34 in the stage portion 50
Outer edge 42.Stage portion 50 has and can store the shape of counter-rotary-ing plate 34 on the inside of it, specifically, by planar bottom surface and
Wall surface is constituted.The depth of stage portion 50 is the degree substantially the same with the thickness of the outer edge of counter-rotary-ing plate 34 42.
Rivet 35 is abutted with a part for its peripheral surface with positive external terminal 15, the two electrical connection as a result,.Furthermore
The intercommunicating pore led to inside and outside shell is formed in rivet 35.In addition, rivet 35 can be made of single component, can also be logical
It crosses multiple components are chimeric and is formed.
Counter-rotary-ing plate 34 is configured to:It can be inverted to 35 side of rivet (that is, 40 energy of central portion by the rising of shell internal pressure
It is enough to detach with connecting elements 32 and moved towards shell exterior).Therefore, when inner pressure of battery rises, by counter-rotary-ing plate 34 to
35 side of rivet inverts, and the electrical connection of interconnecting piece 33 and counter-rotary-ing plate 34 is cut off.
Then, the welded condition of the counter-rotary-ing plate 34 of failure of current mechanism 30 and rivet 35 is illustrated.Fig. 3 is and Fig. 2
III-III lines at failure of current mechanism 30 the corresponding figure in section.
As shown in figure 3, being formed in failure of current mechanism 30, there are one continuous weld marks 60.One continuous weld mark
60, it is in all shapes ground continuous all shapes portion 61 to have the outer edge 42 along counter-rotary-ing plate 34.Counter-rotary-ing plate 34 and rivet 35 pass through this week
Shape portion 61 is engaged.The starting point 62 and terminal 63 of one continuous weld mark 60 have been located off the position in all shape portions 61.
According to such composition, due to the end of the starting point 62 of weld mark 60 when laser welding (i.e. starting point) and weld mark 60
Point 63 when laser welding (i.e. terminal) has left all shape portions 61 at the joint portion as counter-rotary-ing plate 34 and rivet 35, therefore can
Eliminate the failure welding caused by the generation of the solidification cracking of the unstable and terminal point of the fusion penetration of starting point.
Furthermore in figure 3, the starting point 62 of weld mark 60 and terminal 63 are adjacent, but the starting point 62 and terminal 63 of weld mark 60
Position, as long as in all shapes continuous all shape portions 61 can be formed, and deviate from all shape portions 61, it is just without being limited thereto.For example,
The starting point 62 and terminal 63 of weld mark 60 can also be identical position.For example, the starting point 62 and terminal 63 of weld mark 60 also may be used
With positioned at the position separated.It, can also be with from weld mark 60 specifically, for example, the starting point 62 and terminal 63 of weld mark 60
The line segment in terminal 63 to all shape portion 61 of the starting point 62 to the line segment in all shape portions 61 and from weld mark 60 be configured to the side of V shape
Formula, positioned at the position separated.
Furthermore since weld mark 60 is a continuous trace, so in the plane vertical with the depth direction of weld mark 60
Upper is a threadiness, and therefore, there are two ends below for tool.Therefore, which usually becomes in starting point 62 and terminal 63 extremely
Lack either one.The starting point 62 and terminal 63 of weld mark 60 also can by observe the depth etc. of weld mark weld mark state come
Differentiate.
The starting point 62 and terminal 63 of weld mark 60 can also be located in either one of counter-rotary-ing plate 34 and rivet 35, but in order to
Harmful effect, the starting point 62 and terminal 63 of preferred weld trace 60 is not caused to be located on rivet 35 performance of counter-rotary-ing plate 34.
Have on the face of weld mark 60 towards the formation inside battery case, the profile of the shape of rivet 35 can also be circle
Shape, but be the quadrangle form that corner is rounded in the present embodiment.Rivet 35 has towards all shape portions of weld mark 60 as a result,
61 outside region 70 outstanding, and the starting point 62 of weld mark 60 and terminal 63 are located in the region 70.In this way, by rivet
Setting sets the starting point 62 of weld mark 60 and terminal 63 towards the outside region 70 outstanding in all shape portions 61 of weld mark 60 on 35
It sets and is become easy on rivet 35.In the present embodiment, the profile of the shape of rivet 35 is the quadrangle form that corner is rounded,
But if forming the outside region 70 outstanding towards all shape portions 61 of weld mark 60, as long as making the profile of the shape of rivet 35
It is non-circular.
Furthermore in the outside region 70 outstanding in all shape portions 61 towards weld mark 60, the rivet 35 from the region 70
Point on appearance profile is more than to the distance at the center of counter-rotary-ing plate 34 from the point on 35 appearance profile of rivet in other regions to anti-
The distance at the center of flap 34.
In the present embodiment, failure of current mechanism 30 is arranged in the positive external terminal 15 for being fixed on lid 22 and anode
Between (not shown), but it is not limited to this.The either side in side of the positive electrode, negative side can also be arranged in failure of current mechanism 30,
It can also be arranged in side of the positive electrode and this both sides of negative side.In the case of the conductive path that failure of current mechanism is applied to cathode
It constitutes and method, with applied to side of the positive electrode the case where is substantially same, therefore be not repeated herein.
The lithium rechargeable battery 10 constituted as described above, can be used in various uses.As suitable purposes, can lift
Go out to be loaded in the driving in the vehicles such as electric vehicle (EV), hybrid vehicle (HV), plug-in hybrid-power automobile (PHV) to use
Power supply.Lithium rechargeable battery 10, as typical case, battery pack that can be to be constituted multiple connect in series and/or in parallel
Form use.
Then, the manufacturing method of secondary cell of the present embodiment is illustrated.Of the present embodiment two
The manufacturing method of primary cell, including the process of failure of current mechanism is made (hereinafter also referred to as " failure of current mechanism makes work
Sequence ") and use production failure of current mechanism come secondary cell for assembling process (hereinafter also referred to as " and secondary cell assemble work
Sequence "),
The process for making failure of current mechanism includes the following steps:
Counter-rotary-ing plate is fixed on rivet in a manner of the outer edge of counter-rotary-ing plate contact rivet;
Welding laser is scanned since the 1st position of the outer edge for leaving counter-rotary-ing plate, until the outer edge of counter-rotary-ing plate;
Along the outer edge of counter-rotary-ing plate welding laser is scanned in all shapes;With
Welding laser is scanned away from the 2nd position of the outer edge of counter-rotary-ing plate.
First, illustrate failure of current mechanism production process using attached drawing.Fig. 4 is for one embodiment of the present invention
It is that laser welding in the manufacturing method for the secondary cell being related to illustrates, show schematically from being equivalent to inside battery case
The figure of rivet and counter-rotary-ing plate observed of direction.
It, first, will reversion in such a way that the outer edge of counter-rotary-ing plate is contacted with rivet in failure of current mechanism production process
Plate is fixed on rivet.For example, as shown in Fig. 2, the side of the outer edge 42 to configure counter-rotary-ing plate 34 in the stage portion 50 of rivet 35
Formula makes the recess portion space of rivet 35 store counter-rotary-ing plate 34.Thereby, it is possible to what is contacted with rivet 35 in the outer edge of counter-rotary-ing plate 34 42
Counter-rotary-ing plate 34 is fixed on rivet 35 under state.In order to make fixation, can also be welded temporarily according to known methods
It connects.
Then, welding laser is scanned since the 1st position of the outer edge for having left counter-rotary-ing plate, until outside counter-rotary-ing plate
Until edge.For example, as shown in figure 4, being swept as shown by the arrows since having left the point 72 of outer edge 42 of counter-rotary-ing plate 34
Welding laser is retouched, until the outer edge of counter-rotary-ing plate 34 42.The point 72 becomes the starting point of laser welding.Furthermore in Fig. 4
In, from point 72 to the scanning of the welding laser of the outer edge 42 of counter-rotary-ing plate 34, in such a way that operating distance becomes the shortest distance
It carries out.But it can not also be become from point 72 to the scanning of the welding laser of the outer edge 42 of counter-rotary-ing plate 34 with operating distance
The mode of the shortest distance carries out.
Then, along the outer edge of counter-rotary-ing plate welding laser is scanned in all shapes.For example, as shown in figure 4, being used from welding
The place that laser reaches the outer edge 42 of counter-rotary-ing plate 34 starts, and is in along the outer edge 42 of counter-rotary-ing plate 34 as shown by the arrows
Scan welding laser to all shapes.Furthermore welding laser in Fig. 4, is scanned in the direction of the clock.It is however not limited to this,
Welding laser can also be scanned counterclockwise.Here, the scanning of welding laser is throughout the outer edge 42 of counter-rotary-ing plate 34
Week and carry out.
Then, welding laser is scanned away from the 2nd position of the outer edge of counter-rotary-ing plate.For example, as shown in figure 4,
After the scanning of welding laser carries out a circle along the outer edge 42 of counter-rotary-ing plate 34, as shown by the arrows, scanning is to having left
Until the point 73 of the outer edge 42 of counter-rotary-ing plate 34.The point 73 becomes the terminal of laser welding.
Furthermore though point 72 and point 73 be located at counter-rotary-ing plate 34 and rivet 35 which side on can, but in order not to anti-
The performance of flap 34 causes harmful effect, preferred point 72 and point 73 to be located on rivet 35.
Furthermore in Fig. 4, the point 72 as the 1st position and the point 73 as the 2nd position, are set at separated position,
But the 1st position and the 2nd position are not particularly limited as long as the outer edge for having left counter-rotary-ing plate, can also be identical position
It sets.
In Fig. 4, in the same manner as Fig. 2, in rivet 35 towards on face inside battery case, being welded, rivet
The profile of 35 shape becomes non-circular, specifically, the quadrangle form being rounded as corner.Rivet 35 has court as a result,
To the outside region 70 ' outstanding of the outer edge 42 of counter-rotary-ing plate 34.In this way, by being arranged towards counter-rotary-ing plate 34 on rivet 35
Point 72 and point 73 are set on rivet 35 and are become easy by the outside region 70 ' outstanding of outer edge 42.
Such laser welding is carried out, is carried out according to known methods in addition to this, so as to make failure of current machine
Structure.According to such method, the failure welding of failure of current mechanism can be inhibited.That is, even if fusion penetration is not at starting point (point 72)
Stablize, in addition, even if there are solidification crackings at terminal (point 73), since starting point (point 72) and terminal (point 73) have left conduct
The outer edge 42 of the counter-rotary-ing plate 34 at the joint portion of counter-rotary-ing plate 34 and rivet 35, therefore can stablize in the outer edge of counter-rotary-ing plate 34 42
Weld counter-rotary-ing plate 34 and rivet 35 in ground.
Then, secondary cell assembling process is illustrated.In secondary cell assembles process, electric current that use production goes out
Cutting mechanism carrys out secondary cell for assembling.The process can carry out according to known methods.
By operating as described above, secondary cell can be made.In the manufacture of secondary cell of the present embodiment
In method, due to inhibiting failure welding when making failure of current mechanism, with secondary cell on the whole the case where
Under, its yield rate can be improved.
More than, it is described in detail by the concrete example of the present invention, but these examples only illustrate, does not limit request and protect
The range of shield.In technology recorded in claims, including after the concrete example illustrated above is carried out various modifications and changes
Technology.
Claims (6)
1. a kind of secondary cell, has:
Electrode body;
Battery case stores the electrode body;
Electrode terminal is electrically connected with the electrode body;With
Failure of current mechanism configures the conductive path between the electrode body and the electrode terminal, and in the battery
Pressure in shell cuts off the conductive path when rising,
The failure of current mechanism has rivet and is welded in the counter-rotary-ing plate of the rivet,
It is formed in the failure of current mechanism there are one continuous weld mark,
One continuous weld mark has in week shape the continuous all shape portions in outer edge along the counter-rotary-ing plate, also,
The beginning and end of one continuous weld mark has been located off the position in all shapes portion.
2. secondary cell according to claim 1,
The beginning and end of the weld mark is located on the rivet.
3. secondary cell according to claim 2,
The rivet has all shapes towards the weld mark on the face that the formation of the inside towards battery case has weld mark
The outside region outstanding in portion, the beginning and end of the weld mark are located at the region.
4. a kind of manufacturing method of secondary cell, including make the process of failure of current mechanism and the electric current using the making
The process that cutting mechanism carrys out secondary cell for assembling,
The process for making failure of current mechanism includes the following steps:
The counter-rotary-ing plate is fixed on the rivet in a manner of the outer edge of counter-rotary-ing plate contact rivet;
Welding laser is scanned since the 1st position of the outer edge for leaving the counter-rotary-ing plate, until the outer rim of the counter-rotary-ing plate
Portion;
Along the outer edge of the counter-rotary-ing plate welding laser is scanned in all shapes;With
Welding laser is scanned away from the 2nd position of the outer edge of the counter-rotary-ing plate.
5. the manufacturing method of secondary cell according to claim 4,
2nd position of the 1st position and the outer edge for leaving the counter-rotary-ing plate of leaving the outer edge of the counter-rotary-ing plate is located at rivet
On.
6. the manufacturing method of secondary cell according to claim 5,
The rivet has the outside region outstanding towards the outer edge of the counter-rotary-ing plate on the face for carrying out laser welding, from
2nd position of the 1st position and the outer edge for leaving the counter-rotary-ing plate of opening the outer edge of the counter-rotary-ing plate is located at the region.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-070630 | 2017-03-31 | ||
| JP2017070630A JP6802982B2 (en) | 2017-03-31 | 2017-03-31 | Secondary battery and its manufacturing method |
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| CN108695543A true CN108695543A (en) | 2018-10-23 |
| CN108695543B CN108695543B (en) | 2021-04-13 |
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|---|---|
| US (1) | US10707474B2 (en) |
| JP (1) | JP6802982B2 (en) |
| CN (1) | CN108695543B (en) |
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| JP2016091932A (en) * | 2014-11-10 | 2016-05-23 | トヨタ自動車株式会社 | Current cutoff device, manufacturing method of current cutoff device, and secondary battery |
| JP2016110859A (en) * | 2014-12-08 | 2016-06-20 | トヨタ自動車株式会社 | Current cutoff device and secondary battery |
| JP6476941B2 (en) * | 2015-02-05 | 2019-03-06 | 株式会社Ｇｓユアサ | Power storage device, power storage device including power storage device, method for manufacturing power storage device, and method for manufacturing power storage device |
| JP6447266B2 (en) * | 2015-03-11 | 2019-01-09 | トヨタ自動車株式会社 | Manufacturing method of current interrupting device |
| JP6281542B2 (en) * | 2015-08-26 | 2018-02-21 | トヨタ自動車株式会社 | Manufacturing method of sealed battery |
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2017
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- 2018-03-30 US US15/941,408 patent/US10707474B2/en active Active
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| JP2003282029A (en) * | 2002-03-25 | 2003-10-03 | Sanyo Electric Co Ltd | Manufacturing method of square type battery |
| CN101229607A (en) * | 2007-01-23 | 2008-07-30 | 深圳市比克电池有限公司 | Lithium-ion battery laser welding sealing technology |
| CN104303337A (en) * | 2012-05-02 | 2015-01-21 | 丰田自动车株式会社 | Hermetic secondary battery |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP6802982B2 (en) | 2020-12-23 |
| US10707474B2 (en) | 2020-07-07 |
| US20180287128A1 (en) | 2018-10-04 |
| CN108695543B (en) | 2021-04-13 |
| JP2018174057A (en) | 2018-11-08 |
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